/*
 * yocef - Lightweight IoC Event Framework - tutorial
 *
 * Copyright (c) 2009, Yves Cuillerdier
 * All rights reserved.
 * 
 * This software is licensed under the new BSD License:
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, 
 * this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, 
 * this list of conditions and the following disclaimer in the documentation 
 * and/or other materials provided with the distribution.
 * 
 * Neither the name of the author nor the names of its contributors may 
 * be used to endorse or promote products derived from this software without 
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * @version 0.1.0
 */
package yocef.tutorial.ioc.yocef;

import yocef.client.Event;

/**
 * Dependency to Ring removed
 */
public class Clock {
	public static final String START_ALARM_EVENT = "startAlarm"; //$NON-NLS-1$
	public static final String STOP_ALARM_EVENT = "stopAlarm"; //$NON-NLS-1$

	private long time; // seconds in days
	private long alarm = 0; // Default: ring at midnight
	private boolean armed = false;

	private boolean isRinging = false;

	private static final int D_LENGTH = 60 * 60 * 24;
	private static final int RING_TIME = 5 * 60;

	/** Create a Clock */
	public Clock() {
		setTime(System.currentTimeMillis() / 1000);
		// Time change! Manage bell
		checkAlarm();
	}

	/** Setters (no Getters for clarity!) */
	public void setTime(final long t) {
		time = t % D_LENGTH;
		// Time change! Manage bell
		checkAlarm();
	}

	public void setAlarm(final long t) {
		alarm = t % D_LENGTH;
		// Alarm change! Manage bell
		checkAlarm();
	}

	public void setArmed(final boolean arm) {
		armed = arm;
		checkAlarm();
	}

	/** time to add a second */
	public void addTic() {
		time++;
		if (time > D_LENGTH) {
			time -= D_LENGTH;
		}
		// Time passing! Manage bell
		checkAlarm();
	}

	/* Ring the bell */
	private void checkAlarm() {
		if (armed) {
			if (isRinging) {
				if (alarm == (time + RING_TIME) % D_LENGTH) {
					Event.get(STOP_ALARM_EVENT).fire(this, null);
					isRinging = false;
				}
			} else {
				if (alarm == time) {
					Event.get(START_ALARM_EVENT).fire(this, null);
					isRinging = true;
				}
			}
		} else {
			if (isRinging) {
				Event.get(STOP_ALARM_EVENT).fire(this, null);
				isRinging = false;
			}
		}
	}
}
